class Customer{
	private final long customerID;
	private static long counter=200901;
	
	public Customer(){
		customerID = counter++;
	}
	
	public long getID(){
		return customerID;
	}
	
	public static void main(String[] args){
		Customer cc1=new Customer();
		System.out.println("First customerID is "+cc1.getID());
		cc1.customerID=100;
		System.out.println("Changed customerID is "+cc1.getID());
		Customer cc2=new Customer();
		}
	}	
	